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Hi
Just done a Flow and pressure test
Flow 3,3 L in 10 secs =19.8
( did it 3 times pretty consistent)
Pressure 4 Bar
This however was at kitchen sink downstairs but looking to install Unvented Cylinder ( santon or Mega or similar) in loft ( servicing 1 bathroom + 1 onsuite ) will/ is this going to decrease by much going up approx 5.3 mtrs ( 2 storeys ) I think the pressures ok but the Flow may be on the cusp ?? Any thoughts
Thanks
 
Aslong as the mains is done in 22mm from the stop tap you will be fine
 
You loose 0.1 bar per meter so you would still be ok pressure wise . Sorry not totaly sure how you have done your flow test .
 
The flow I filled a bucket for 10 seconds
The amount was 3.3 Ltrs so 3.3 x 6=19.8 in 1 minute I think that's how it's calculated or is that a bit Heath Robinson lol
 

best way to, else the drop might be too much
 
Do you think the flow will be enough ?

if you run it from the mains in 22mm yes and use as many formed bends as possible
 
The flow I filled a bucket for 10 seconds
The amount was 3.3 Ltrs so 3.3 x 6=19.8 in 1 minute I think that's how it's calculated or is that a bit Heath Robinson lol

Never seen it done that way but yes I see how its done ...
Sorry I have to ask , are you installing this cylinder
 
I can understand you doing some groundwork pal , but please make sure somebody is G 3 qualified to install it if you go ahead
That's a good point silly question but what do I ask for proof of this ... what do they hold as proof ...is it a BPEC certificate ?
 
That's a good point silly question but what do I ask for proof of this . what do they hold as proof ...is it a BPEC certificate ?

Yes or if there has safe should have it on there card
 
Different bodies do the qualification ( 2 at least lol )
They must be 3 G thats all you need to ask
 
Hang on. I'm not G3, but I would suspect that 4 Bar is his static pressure. Won't his installer need to know what the operating pressure is, at a given flow rate?
 
Not necessarily, I expect a poor flow would be the result of a bad working pressure. Just that a pressure test carried out at a given flow might have given an idea whether your mains is capable of giving more than the ?19l flow you had via that tap (could be the tap itself is the restiction), or if that's the maximum of your supply.
But, as others have said, someone with an unvented qualification (not me) will know the proper tests to perform.
 
Most taps restrict the flow massively, - particularily modern taps, so I only use them as a rough guide. If flow and pressure is very acceptable from an outside tap, then I know flow will be excellent from an open pipe.
 
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